Can't locate it on the Autoleads website, but their local dealer, who I've dealt with for years, is walking distance from here. If you like, I'll take the pertinent part round to show them and see if they can order it.

UPDATE: They're £2.50(@$3.75=1 1/2 Pints*) and they have them in stock, these are plastic coated, not as supplied with the tuner. Send me a PM with your address if you want one sent over, or I could bring it to the meet if you're not fussed for time..

*I'm only guessing, I've not had a drink since the 7th March, so I'm a little out of touch!